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SAN FRANCISCO (CBS SF) — High winds and choppy Bay waters have prompted a rare closure of Alcatraz Island to visitors Wednesday, a National Park Service spokeswoman said.

The park service and officials with Alcatraz Cruises, the official concessionaire for tours to the shuttered jail, made the call shortly after 11 a.m. to shut down trips to the island because of unsafe conditions, NPS spokeswoman Alexandra Picavet said.